Package cn.mapway.ui.client.widget.canvas

Class CanvasWidget

java.lang.Object
com.google.gwt.user.client.ui.UIObject
com.google.gwt.user.client.ui.Widget
com.google.gwt.user.client.ui.FocusWidget
cn.mapway.ui.client.widget.canvas.CanvasWidget
All Implemented Interfaces:
com.google.gwt.animation.client.AnimationScheduler.AnimationCallback, com.google.gwt.event.dom.client.HasAllDragAndDropHandlers, com.google.gwt.event.dom.client.HasAllFocusHandlers, com.google.gwt.event.dom.client.HasAllGestureHandlers, com.google.gwt.event.dom.client.HasAllKeyHandlers, com.google.gwt.event.dom.client.HasAllMouseHandlers, com.google.gwt.event.dom.client.HasAllTouchHandlers, com.google.gwt.event.dom.client.HasBlurHandlers, com.google.gwt.event.dom.client.HasClickHandlers, com.google.gwt.event.dom.client.HasDoubleClickHandlers, com.google.gwt.event.dom.client.HasDragEndHandlers, com.google.gwt.event.dom.client.HasDragEnterHandlers, com.google.gwt.event.dom.client.HasDragHandlers, com.google.gwt.event.dom.client.HasDragLeaveHandlers, com.google.gwt.event.dom.client.HasDragOverHandlers, com.google.gwt.event.dom.client.HasDragStartHandlers, com.google.gwt.event.dom.client.HasDropHandlers, com.google.gwt.event.dom.client.HasFocusHandlers, com.google.gwt.event.dom.client.HasGestureChangeHandlers, com.google.gwt.event.dom.client.HasGestureEndHandlers, com.google.gwt.event.dom.client.HasGestureStartHandlers, com.google.gwt.event.dom.client.HasKeyDownHandlers, com.google.gwt.event.dom.client.HasKeyPressHandlers, com.google.gwt.event.dom.client.HasKeyUpHandlers, com.google.gwt.event.dom.client.HasMouseDownHandlers, com.google.gwt.event.dom.client.HasMouseMoveHandlers, com.google.gwt.event.dom.client.HasMouseOutHandlers, com.google.gwt.event.dom.client.HasMouseOverHandlers, com.google.gwt.event.dom.client.HasMouseUpHandlers, com.google.gwt.event.dom.client.HasMouseWheelHandlers, com.google.gwt.event.dom.client.HasTouchCancelHandlers, com.google.gwt.event.dom.client.HasTouchEndHandlers, com.google.gwt.event.dom.client.HasTouchMoveHandlers, com.google.gwt.event.dom.client.HasTouchStartHandlers, com.google.gwt.event.logical.shared.HasAttachHandlers, com.google.gwt.event.shared.HasHandlers, com.google.gwt.user.client.EventListener, com.google.gwt.user.client.ui.Focusable, com.google.gwt.user.client.ui.HasEnabled, com.google.gwt.user.client.ui.HasFocus, com.google.gwt.user.client.ui.HasVisibility, com.google.gwt.user.client.ui.IsWidget, com.google.gwt.user.client.ui.SourcesClickEvents, com.google.gwt.user.client.ui.SourcesFocusEvents, com.google.gwt.user.client.ui.SourcesKeyboardEvents, com.google.gwt.user.client.ui.SourcesMouseEvents
Direct Known Subclasses:
ColorCanvas, HueChooser
public class CanvasWidget extends com.google.gwt.user.client.ui.FocusWidget implements com.google.gwt.animation.client.AnimationScheduler.AnimationCallback
CanvasWidget 颜色面板
Author:
zhang

  • Nested Class Summary

    Nested classes/interfaces inherited from class com.google.gwt.user.client.ui.UIObject

    com.google.gwt.user.client.ui.UIObject.DebugIdImpl, com.google.gwt.user.client.ui.UIObject.DebugIdImplEnabled

  • Field Summary

    Fields inherited from class com.google.gwt.user.client.ui.UIObject

    DEBUG_ID_PREFIX

  • Constructor Summary

    Constructors
    Constructor
    Description
    CanvasWidget()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    execute(double timestamp)
     
    com.google.gwt.dom.client.CanvasElement
    getCanvasElement()
    Returns the attached Canvas Element.
    com.google.gwt.canvas.dom.client.Context
    getContext(String contextId)
    Gets the rendering context that may be used to draw on this canvas.
    com.google.gwt.canvas.dom.client.Context2d
    getContext2d()
    Returns a 2D rendering context.
    int
    getCoordinateSpaceHeight()
    Gets the height of the internal canvas coordinate space.
    int
    getCoordinateSpaceWidth()
    Gets the width of the internal canvas coordinate space.
    double
    getDpr()
     
    Size
    getSpaceSize()
     
    protected void
    onDraw(double timestamp)
    需要绘制画布
    protected void
    onLoad()
     
    protected void
    onUnload()
     
    void
    redraw()
     
    Size
    resizeWindow()
     
    void
    setContinueDraw(boolean continueDraw)
     
    void
    setCoordinateSpaceHeight(int height)
    Sets the height of the internal canvas coordinate space.
    void
    setCoordinateSpaceWidth(int width)
    Sets the width of the internal canvas coordinate space.
    void
    setPixelSize(int width, int height)
     
    String
    toDataUrl()
    Returns a data URL for the current content of the canvas element.
    String
    toDataUrl(String type)
    Returns a data URL for the current content of the canvas element, with a specified type.
    static CanvasWidget
    wrap(com.google.gwt.dom.client.CanvasElement element)
     

    Methods inherited from class com.google.gwt.user.client.ui.FocusWidget

    addBlurHandler, addClickHandler, addClickListener, addDoubleClickHandler, addDragEndHandler, addDragEnterHandler, addDragHandler, addDragLeaveHandler, addDragOverHandler, addDragStartHandler, addDropHandler, addFocusHandler, addFocusListener, addGestureChangeHandler, addGestureEndHandler, addGestureStartHandler, addKeyboardListener, addKeyDownHandler, addKeyPressHandler, addKeyUpHandler, addMouseDownHandler, addMouseListener, addMouseMoveHandler, addMouseOutHandler, addMouseOverHandler, addMouseUpHandler, addMouseWheelHandler, addMouseWheelListener, addTouchCancelHandler, addTouchEndHandler, addTouchMoveHandler, addTouchStartHandler, getFocusImpl, getTabIndex, isEnabled, onAttach, removeClickListener, removeFocusListener, removeKeyboardListener, removeMouseListener, removeMouseWheelListener, setAccessKey, setEnabled, setFocus, setTabIndex

    Methods inherited from class com.google.gwt.user.client.ui.Widget

    addAttachHandler, addBitlessDomHandler, addDomHandler, addHandler, asWidget, asWidgetOrNull, createHandlerManager, delegateEvent, doAttachChildren, doDetachChildren, fireEvent, getHandlerCount, getLayoutData, getParent, isAttached, isOrWasAttached, onBrowserEvent, onDetach, removeFromParent, setLayoutData, sinkEvents, unsinkEvents

    Methods inherited from class com.google.gwt.user.client.ui.UIObject

    addStyleDependentName, addStyleName, ensureDebugId, ensureDebugId, ensureDebugId, getAbsoluteLeft, getAbsoluteTop, getElement, getOffsetHeight, getOffsetWidth, getStyleElement, getStyleName, getStyleName, getStylePrimaryName, getStylePrimaryName, getTitle, isVisible, isVisible, onEnsureDebugId, removeStyleDependentName, removeStyleName, resolvePotentialElement, setElement, setElement, setHeight, setSize, setStyleDependentName, setStyleName, setStyleName, setStyleName, setStyleName, setStylePrimaryName, setStylePrimaryName, setTitle, setVisible, setVisible, setWidth, sinkBitlessEvent, toString

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

    Methods inherited from interface com.google.gwt.event.shared.HasHandlers

    fireEvent

  • Constructor Details

    • CanvasWidget

      public CanvasWidget()

  • Method Details

    • wrap

      public static CanvasWidget wrap(com.google.gwt.dom.client.CanvasElement element)

    • onLoad

      protected void onLoad()
      Overrides:
      onLoad in class com.google.gwt.user.client.ui.Widget

    • getDpr

      public double getDpr()

    • resizeWindow

      public Size resizeWindow()

    • getSpaceSize

      public Size getSpaceSize()

    • getCanvasElement

      public com.google.gwt.dom.client.CanvasElement getCanvasElement()
      Returns the attached Canvas Element.
      Returns:
      the Canvas Element

    • getContext

      public com.google.gwt.canvas.dom.client.Context getContext(String contextId)
      Gets the rendering context that may be used to draw on this canvas.
      Parameters:
      contextId - the context id as a String
      Returns:
      the canvas rendering context

    • getContext2d

      public com.google.gwt.canvas.dom.client.Context2d getContext2d()
      Returns a 2D rendering context.

      This is a convenience method, see getContext(String).

      Returns:
      a 2D canvas rendering context

    • getCoordinateSpaceHeight

      public int getCoordinateSpaceHeight()
      Gets the height of the internal canvas coordinate space.
      Returns:
      the height, in pixels
      See Also:

    • setCoordinateSpaceHeight

      public void setCoordinateSpaceHeight(int height)
      Sets the height of the internal canvas coordinate space.
      Parameters:
      height - the height, in pixels
      See Also:

    • getCoordinateSpaceWidth

      public int getCoordinateSpaceWidth()
      Gets the width of the internal canvas coordinate space.
      Returns:
      the width, in pixels
      See Also:

    • setCoordinateSpaceWidth

      public void setCoordinateSpaceWidth(int width)
      Sets the width of the internal canvas coordinate space.
      Parameters:
      width - the width, in pixels
      See Also:

    • toDataUrl

      public String toDataUrl()
      Returns a data URL for the current content of the canvas element.
      Returns:
      a data URL for the current content of this element.

    • toDataUrl

      public String toDataUrl(String type)
      Returns a data URL for the current content of the canvas element, with a specified type.
      Parameters:
      type - the type of the data url, e.g., image/jpeg or image/png.
      Returns:
      a data URL for the current content of this element with the specified type.

    • setPixelSize

      public void setPixelSize(int width, int height)
      Overrides:
      setPixelSize in class com.google.gwt.user.client.ui.UIObject

    • onUnload

      protected void onUnload()
      Overrides:
      onUnload in class com.google.gwt.user.client.ui.Widget

    • execute

      public void execute(double timestamp)
      Specified by:
      execute in interface com.google.gwt.animation.client.AnimationScheduler.AnimationCallback

    • setContinueDraw

      public void setContinueDraw(boolean continueDraw)

    • redraw

      public void redraw()

    • onDraw

      protected void onDraw(double timestamp)
      需要绘制画布
      Parameters:
      timestamp -